JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Please try increasing the width of the iframe 110% in the iframe embed code so that the borders will be displayed normally on the embedded page.
If you are using a frame from your website builder, you may try increasing the frame width to see the form is displayed correctly. After increasing the width, the form should be displayed on the page as below:
Hope this information helps!